Defective pro mini and the solution
I had a pro mini which stopped working with the following symptoms:
- No communication
- not even a flicker on Pin 13 LED
- not responding to programming attempts, not even with ISP.
- RST pin has a voltage of ca. 100mV
The pro mini started working again without me doing anything and then after a few months stopped working again.
After a lot of soldering (replacing most components including the atmega) it turned out that the board had a ca. 100 Ohm short between RST and GND...
So if you experience the above symptoms just measure resistance between RST and GND.
@fleinze interesting experience. Thanks for sharing.